#include <iostream>
#include <string>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include "Comm.hpp"

using namespace std;

void handler(int signo)
{
    std::cout << "signo: " << signo << std::endl;
    exit(0);
}

#define Retry_Count 5

void Usage(const std::string &process)
{
    std::cout << "Usage: " << process << " server_ip server_port" << std::endl;
}

bool visitServer(std::string &serverip, uint16_t &serverport, int *cnt)
{
    // 1. 创建socket
    string inbuffer;
    char server_list[1024];
    ssize_t n = 0;
    ssize_t m = 0;
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
    {
        cerr << "socket error " << endl;
        // exit(Socket_Err);
        return false;
    }

    bool ret = true;
    // 2. 要不要bind？必须要有Ip和Port, 需要bind，但是不需要用户显示的bind，client系统随机端口
    // 发起连接的时候，client会被OS自动进行本地绑定
    // 2. connect
    struct sockaddr_in server;
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport);
    // p:process(进程), n(网络) -- 不太准确，但是好记忆
    inet_pton(AF_INET, serverip.c_str(), &server.sin_addr); // 1. 字符串ip->4字节IP 2. 网络序列

    n = connect(sockfd, CONV(&server), sizeof(server)); // 自动进行bind哦！
    if (n < 0)
    {
        cerr << "connect error" << endl;
        ret = false;
        goto END;
    }

    // 重置重连时间
    *cnt = 0;

    m = read(sockfd, server_list, sizeof(server_list));
    if (m > 0)
    {
        server_list[m] = 0;
        cout << "服务器列表# " << server_list << endl;
    }

    cout << "Please Select Server# ";
    getline(cin, inbuffer);
    n = write(sockfd, inbuffer.c_str(), inbuffer.size());

    cout << "Enter> ";
    getline(cin, inbuffer);
    if (inbuffer == "quit")
        return true;

    n = write(sockfd, inbuffer.c_str(), inbuffer.size());
    if (n > 0)
    {
        char buffer[1024];
        m = read(sockfd, buffer, sizeof(buffer) - 1);
        if (m > 0)
        {
            buffer[m] = 0;
            cout << "get a echo message -> " << buffer << endl;
        }
        else if (m == 0)
        {
            return true;
        }
        else
        {
            ret = false;
            goto END;
        }
    }
    else
    {
        std::cout << "hello write Error" << std::endl;
        ret = false;
        goto END;
    }

END:
    close(sockfd);
    return ret;
}

// ./tcp_client serverip serverport
int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        Usage(argv[0]);
        return 1;
    }
    std::string serverip = argv[1];
    uint16_t serverport = stoi(argv[2]);

    signal(SIGPIPE, SIG_IGN);

    // for (int i = 1; i <= 31; i++)
    // {
    //     signal(i, handler);
    // }

    int cnt = 1;
    while (cnt <= Retry_Count)
    {
        bool result = visitServer(serverip, serverport, &cnt);
        if (result)
        {
            break;
        }
        else
        {
            sleep(1);
            std::cout << "server offline, retrying..., count : " << cnt << std::endl;
            cnt++;
        }
    }

    if (cnt >= Retry_Count)
    {

        cout << "server offline" << endl;
    }
    return 0;
}